Undraw the window curtain, let fresh air pour in, do not fear to crush the window sash.
apply putty in order to fix or fill, as of a window sash, for example.
The slide block on the window sash is pulled by the support, slides along the runner of the window sash, thereby limiting the position of the window sash.
The window sashes caused to move in the seams are naturally wiped by the wiping layers.